Reinforcement Detailing of Beams from ETABS output
Challenge 7 – Detailed design of concrete buildings -1
Detail design of beams in Etabs 2018.
The ETABS file for a G+4 building is provided. Run the analysis and design of the RCC Moment ResistingFrame. The following challenge deals specifically with two continuous beams in the 1st floor.
1) 3 span continuous beam along grid A
2) 7 span continuous beam along grid 3
Address the following issues thereafter.
• Provide details of longitudinal and shear reinforcement for the two continuous beams. Sketch the beam elevation details or draft it using AutoCAD software. A sample of how beam elevation details are prepared in consultancy firms is provided below. Participants can prepare it as per their preference:
- Provide reasons for the failure of the middle span along grid A. What are the possible ways this issue can be resolved?
Calculate the value of the maximum shear force in any one of the spans in both the continuous beams, as per clause 6.3.3 (b) in IS 13920 – 2016. Also, confirm these values from shear force demand calculated by ETABS. Please note that if longitudinal reinforcement provided is more than required (as per ETABS results), the shear force demand will vary from what is provided by ETABS.
AIM: To design the beams in detail using ETABS.
Procedure:
Step 1: First we have to open challenge 7 in ETABS.
Step2: Next we have to check the Model.
Step3: Next we have to do the run analysis and then do the combinations check.
Step4: Next we have to start the design check.
Step5: All members are passed.
Step6: Now shear and flexural reinforcement are noted from the frame design output for the requested RC beams along Grid -A and Grid – D.
Setp7: As per the noted rebar outputs the longitudinal sections for those two RC beams are drawn using AutoCAD and the detailing is done with IS 13920-2016 requirements.
Step8: Results are seen in the details are-
Shear details as per clause 6.3.3 the design force is 237.54 kN.
Max shear force got is 189.05kN.
RESULT:
Thus, the given ETABS model is designed and RC beams are detailed as per the requirements of IS 13920-2016. And also calculated the value of maximum shear force in the continuous beams using the ETABS software.